Waluigi is a villain in SuperMarioLogan. He is Wario's brother and partner-in crime.
He is voiced by Logan Thirtyacre, the creator of the SuperMarioLogan videos. He was originally going to be voiced by a fan of Logan's choice, but he was voiced by Logan instead.
Waluigi first appeared in an update video which was made in 2010. After that, he didn't appear in any other videos until 2013.
When he appeared in Mario's Wig, he didn't have a name in that video. He also didn't talk in Mario's Wig as he only communicates in "WAA" sounds.
Waluigi is also one of the two titular antagonists of Wario and Waluigi's Scam!, alongside Wario. Wario and Waluigi both tried to scam Mario, but they were put in jail with Bubbles at the end of the video. They plan on escaping, but Bubbles tells them that there's no escaping from his cell.
He made cameo appearances in the background in the Who Wants to Be a Millionaire? series.
Wario and Waluigi both later returned in the Pokemon series. Waluigi was one of the members of the Team Rocket along with Wario and Meowth. They try to steal Bowser Junior's Pikachu, but they were defeated by Pikachu using a thunderbolt to blast them into the sun.
Waluigi and Wario never returned again. They both, however, made an appearance in Cody Plays Tennis!, but appeared in the game only.
Just like Wario, Waluigi is an evil con-artist who likes to commit crimes. He can get annoyed with Wario usually when he gets distracted.
Unlike his original counterpart, the SML version of Waluigi is not an On & Off villain at all, and he is pretty much always a villain.